Jack Dorsey announced on July 21, 2026, that Block launched Buzz, a free and open-source workspace that unites human employees, AI agents, group chat, and software repositories behind a single identity system [1, 2, 3]. Buzz aims to challenge platforms like Slack and GitHub by integrating team conversations, AI agents, and Git project management within one application [1, 2, 3].
Built on the decentralized messaging protocol Nostr, Buzz provides cryptographically signed messages and identities for both human users and AI agents, enhancing security and identity management [1, 3]. Each AI agent in Buzz holds its own cryptographic keypair and is treated as a full participant with a distinct identity cryptographically linked to a human owner [1, 3].
The platform offers channels, threads, direct messages, shared canvases, media sharing, search, audit logs, and YAML-based workflows, with desktop apps available for macOS, Windows, and Linux [1, 2, 3]. Git hosting is integrated, allowing feature branches as channels, tracking patches, continuous integration results, review comments, and merge decisions in a unified record [1].
Buzz is open source under the Apache 2.0 license, with its code published on GitHub. Block is hosting its own Nostr relay for Buzz and opened public signups simultaneously with the launch [1, 2, 3]. The platform is model-agnostic, decentralized, and self-sovereign, letting teams customize and self-host instances according to their needs [1, 2].
Bradley Axen, Block’s Head of AI Capabilities, said, "Everyone misses that second conversation, and at least for building software, that’s where the conversation is really interesting. That’s where you make all the technical decisions," highlighting Buzz’s focus on deep collaborative discussions [3]. Paradigm CTO Georgios Konstantopoulos noted that enterprise users will want to self-host for security and control, suggesting Buzz’s potential niche despite early limitations [2].
Buzz remains in early stages and may not yet be ready for full migration from existing tools, as noted by analysts [2]. Public signups are open, and the platform is available to developers and teams interested in exploring its unified collaboration environment [3].
